1. School of Petrochemical Engineering, Changzhou University, Changzhou, P.R. China
2. School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, P.R. China
3. Exploration and Development Research Institute of Shengli Oilfield, Dongying, P.R. China
4. Zhuangxi Oil Production Plant of Sinopec Shengli Oilfield, Dongying, P.R. China